Combined ERT and GPR Data for Subsurface Characterization of Weathered Hilly Slope: A Case Study in Zhejiang Province, Southeast China

Rain-triggered landslides frequently threaten public safety, infrastructure, and the economy during typhoon seasons in Zhejiang Province. Landslides are complex structural systems, subsurface features play a significant role their stability. Their early identification evaluation of potential danger terms rupture surface unstable body essential for geohazard prevention protection. However, information about acquired by conventional exploration approaches is generally limited to sparse data. This paper describes joint application ground-penetrating radar (GPR) with 100 MHz antenna electrical resistivity tomography (ERT) method Wenner configuration identify stratum structure delineate potentially clay-rich slope, results which were further verified using borehole data field observation. The from GPR ERT surveys, consistent each other, indicate two stratigraphic layers comprising silty clay mudstone. Moreover, zone very likely exists highly weathered mudstone depth range 3–7 m, average 5 m. In addition, thickness mass greater on east crest parts slope. Conclusively, optimum combination reliable conducting rapid effective delineation characteristics clayey slopes risk assessment mitigation season.